diff --git a/platform/sky/contiki-conf.h b/platform/sky/contiki-conf.h
index 3adbd37ee..218ff155c 100644
--- a/platform/sky/contiki-conf.h
+++ b/platform/sky/contiki-conf.h
@@ -1,5 +1,5 @@
 /* -*- C -*- */
-/* @(#)$Id: contiki-conf.h,v 1.36 2009/02/27 14:53:15 nvt-se Exp $ */
+/* @(#)$Id: contiki-conf.h,v 1.37 2009/02/28 13:41:16 nvt-se Exp $ */
 
 #ifndef CONTIKI_CONF_H
 #define CONTIKI_CONF_H
@@ -19,7 +19,7 @@
 #define TIMESYNCH_CONF_ENABLED 1
 #define CC2420_CONF_TIMESTAMPS 1
 
-#define CFS_OFFSET_TYPE		unsigned long
+#define CFS_OFFSET_TYPE		long
 
 #define PROFILE_CONF_ON 0
 #define ENERGEST_CONF_ON 1